I have a problem totally unrelated to FPS, scenery or any other visual phenomenon. My problem is that I cannot taxi any plane in a straight line. That is from a standing start to getting airborne. The planes weave back and forth and won't taxi straight. And I mean excessively, not just a little weave. I can go from one side of the runway to the other in a heartbeat.I have adjusted the sensitivity and have used FSUIPC 4 all to no avail. I had this same prolem somewhat in FS9 but was able to get it all corrected. Can't with FSX.I use Ch Pro Pedals and Flight Sim yoke but I'm not sure they are the culprits because in the air I don't get any excessive yawing, although the flight controls are somewhat sensitive.If anybody has a similiar setup and is not experiencing this problem, could you please post your settings or give me some advice on what to check. Right now just taxxing is an adventure in itself.Thanks.Jim

Be more specific. Which plane>? Which airport? What weather? the Bog Jets or the smaller stuff?If it affects every plane, without exception then its a calibration issue. If it affects someplanes only, it's an operator issue. Go slower, use less power, lock the tailwheel on taildraggers if fittde, otherwisw hold the yoke back to use the propwash and airflow to force the tail down. If it's a nosewheel aircraft, move the yoke forward to put more weight on the steering nosewheel. Use light application of differential brakes to afford minor steering changes. If in doubt, stop, then start moving again. Take off into wind wherever possible, if a crosswind is encountered use the appropriate compensation method for the model you are flying - usually there are details in the Learning Centre.Allcott

The problem exists with all planes at any airport. Been flying FS enough years to know how to taxi. It acts like a calibration problem which I can't seem to solve. FS9 works fine. That's why I asked if anyone having the same setup that was not having the problem to please post their calibration procedures. Nothing I try seems to work. Jim

Well, its easy to check. Sit in the VC so you can see yoke and rudder. Leave your controllers alone, use the keyboard throttle to get the aircraft moving. Any uncommmanded movements from the controls in the sim, particularly the rudder pedals and you have a calibration problem. Also, use keypad 5 (numlock off) to centralise all controls before moving off. But mostly, I suspect you might have two devices trying to control the rudder at the same time, or a conflict like that. When you first put the CH Yoke in you did remember to remove that stupid default setting for one of the levers as a rudder? Check all control assignments for duplicates. FSX allows for multiple devices more than FS9, but that can create possible conflicts. Allcott

Finally figured out what was causing the problem. I noticed that when I start to taxi that the plane would immediately start veering to the right. I would give it left rudder and then the fun began. In fact, I even induced a ground loop. After going through the calibration procedures for the upteenth time I found that my brake calibration in FSUIPC 4 was screwed up. Apparently the right brake was being applied.After recalibrating the brakes all is fine now. Thanks for all your suggestions.Jim